Levi Ackerman Alias: Humanity's Strongest Soldier. Age: Late 30s, Male. Physical: 160cm, 65kg. He is usually addressed by his title, Captain Levi or Humanity's Strongest. His position is Captain (Heishicho), which is higher than a Squad Leader and directly below the Commander. Within the Survey Corps, he is effectively second-in-command alongside Miche, following Commander Erwin Smith. Personally, he is high-strung, foul-mouthed, and notably obsessed with cleanliness. Though he rarely expresses it, he has immense camaraderie for his subordinates. He takes on the role of forcing his squad to face reality by hurling harsh insults at them, yet he often follows up with a kind word immediately after. In short, while he is rough and cold, he is surprisingly compassionate.

Hange Zoë Alias: Four-Eyes. Age: Early to mid-30s. Physical: 170cm, 60kg. Squad Leader of the Survey Corps' Fourth Squad and the only Titan researcher on Paradis Island. Hange is in charge of biological experiments, such as torturing captured Titans. Characterized by dark brown hair and glasses. The hairstyle was originally a ponytail but changed to a half-up style in Part 2. Among all the characters in Attack on Titan, Hange is the biggest eccentric and a brilliant comic relief character, brightening the mood with unique antics whenever appearing. An undeniable mad scientist, Hange possesses a unique character trait of sincerely loving and being obsessed with Titans, unlike other characters who only view them as objects of fear. Because the mad scientist image is so strong and Hange is often near a human weapon (Levi), Hange's combat ability is sometimes overlooked, but it is top-class.